Coking retort oven



Jan, 27, 1925. 1,524,120

J.BECKER coKlNG RETORT OVEN origina F11ed Aug. s, 1921 s sheets-sheet 1 im 27, i925 1,524,120

J. BECKER COKING RETORT OVEN Original Filed Aug. 5,- 1921 6 Sheets-Sheet 2 J. BECKER COKlNG RETORT OVEN Original Filed Aug. C- 1921 6 Sheets-Sheet Jan, 27, 1925. y Lzzai@ J. BECKER COKlNG RETORT OVEN Original Filed Aug. 5, 1921 6 Sheets-Sheff:I 4

Jan, 27, 1925.

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. .1,524,120 J.BECKER ycoKlNG RETOHTOVEN` Original Filed Aug. 5 1921 6 Sheets-Sheet 5 J. BECKER COKING RETORT OVEN `Patented Jan. 27,1925.

' insu'ntnv STATES PATENT oFF1cE.

` .1 osErH-. Bncixnn,fglor rirrsnuaemimimsrnvama, As'sIcrNoi?u To THE xorimis coinrnNY, or PITTSBURGH, PENNSYLVANIA, a CORPORATION or rnNNsYLvnNra l come aEronT'ovnN.

l'.ippueal'tien nien augpxt :5, 132i, serial No. 490,986.- iienewed :une 7, 19e-1.1

To' eilt` whom it concern: l

Be ;it known that I, JosnriV BECKER, a citizen O the United States, residing in Pittshgrgl'nin the county of Allegheny and State I. Improvement in Coking Retort vens, owhich the following isl especifica- 'invention comprehends 'improvements of general utility inl thg'coking retort oven art; and alsocomprehends certain improvements especially; a plicable to coking retort ovens of the well cnown cross regeni erative type exemplified in the. Patent m H Koppers No. 818,033, dated April .17, 1906, and in my prior Patent No. 1,374,546, dated April '12, 1921. i i

The inyenuen has for objects the 'R1-bvisionof-a coldng retort oven having as 1m-.`

portant characteristics; an improved ue construction that rmits a considerable re'- duction not onlyin the length but also in tliecro'ss sectional .dimensions of the horiity ofthe llatter with 'each other; a

zontal or busA fines 'located at the top-of the vertical flame ilues and connecting anluralas a ,feature that may be secured by the` above `structural improvements, a novel system of [control of the ow through the ame lues of A'the heating walls, permitting flow in the saine direction through all the flame iues of' each heating wall,\vith discharge of the iow 'from the bur-ning fines through the down-flow operating dues through duct ,ue which extends frpm end to end of the .jheating wall,- each horizontal fine of the pair being connected by diict means constituted of a-plurality of channels with .the corresponding horizontal flue of the next adja-v cent heating wallf" With Such horizontal iue vand out-flow duct construction, cach horizontal Hue-heed conununicate with only approximately half vthe total number of dues of the hcatingwall and each channel is only required to receive partV of the flow from its communicably connected horizonnisylvania, have invented aggnew and facilitating the coking of -or advantages in construction an tal humconsequently the'diiiiensions of the horizontal ues and out-How duct means or channels-.may be considerably decreased or reduced because of the consequent reduction in volume of flow which must be maintained through each horizontal flue and each outow channel. The above statedreduction inl size of the horizontal iiues and out-,How channels isvan im rtant'advan e for the reason that itena les a conside le thickening and strengthening of the walls of the A oven structure in the region y,of `the horizontal iiues.. Moreover, the improved flue and duct construction permits an increase in the height of the flame lues, with a corresponding increase'in the'height of the cok- -ing chambers -so that the latter may be made narrower in width, a develo ment reatlv liii h g1 t1` g vo a i e coals, and yet vhaving adequate provision for'taking care of the increased volume of combustion products, without .making it necessary to enlar e the horizontal fine dimeisions and outow duct means to sizes inconsistent with adequate strength of the wall construction in the region of such fines. The improvements of the invention are furthermore of great importance in oven batteries red with extraneously-derived gas,

Buch as producer gas, `since theem loyincnt .of such gas, results in an increase volume of combustionproducts and adequate iiue "spaces must be provided to collect and feed to the'down-low operating iues this in- Y creased volume of combustion roducts. By the'invention, the flue and. outow duct construction may be adequately accommodated to such-increased volume of combustion products without introducingelements of weakness into the wall structure.

In addition to the general objects recited above, the invention compi'ehends a novel regenerator construction and system of -flow therethrough and-.through the lu'es, promotin uniformity of distribution, and has for ot er objects such other inirovements y goperation as are found to obtain in the structures and devices hereinafter', described or claimed.

. In the accompan in drawin forming a part of this speci cation and s iowin for purposes of exemplication, a pre erred orm and `manner in which the invention may be embodied and practiced, but with.-

out limiting the claimed invention to such A illustrative instance or instances:

Flgure 1 1s a, composlte side elevational View showing both the pusher side and the coking side of a. cokeoven battery having in its constructionv some of the heating walls provided with rectangular tlues and others with triangular ,lues, the battery embodying features above specified and equipped with the limprovements of the presentl invention;

Fig.'2 is a transverse sectional elevation tion taken transversely of the cokeoven battery 1n planes indicated by. thel line F-F of Fig. 3, showing the duct connections of the' triangular flues with the regenerators;

Fig. 5 is a composite vertical sectional elevation taken-transversely of the coke oven battery through a rectan u'lar-ued heating wall in lanes indicated` y the lines A-*A and B- of Fig. 3; and

vFi 6 is another lcomposite vertical Vsectiona 'elevation taken transversely of the coke oven battery through a heating wall in planes indicated by the lines G-G and E-E of Fig. 3.

The same charactersof reference designate the same parts in each of the several views of the drawings.

In the embodiment .illustrated 4in the drawings the invention is incorporated in a combination coke oven battery, i. e., a batte -having provision for being operated. eit er with producer gas as a fuel, or with coke oven gas burned in an atmosphere ot ordinary preheated air such as is ntilized in -ordinary colnngovens, or with coke oven gas burned in an atmosphere containing both air and a neutral gaseous diluent which is introduced into the flame flues separately from the air. A combination coke oven batteryhaving these features is described and. claimed in my application for patent for coking retort oven tiled` April 23, 1920, Serial No. 376,126. For convenience the present description will be' confined to the present illustrated embodimentA of 'the invention in such a combination oven battery; the. novel features and improvements made by the invention are susceptible of other applications such, Afor example, to ordinary socalled coke ovens employing cokgifV oven gas as the fuel, or ordinary soecalled gas ovens? employing an extraneously ,Suh 'asf 'liroiyiuelas thefuel, henceythe scope of the invention cross-wise elon ated heating wa ls 11,11 and a plurality of intermediate cross-wise elongated vertical coking chambers 12, 12. 'The eating walls 11 form the side walls of the respectlve coking chambers 12, as shorwn more particularly in F igs. l and 3, and, in the resent instance, are directly supported by t e heavy su porting or pillar walls 13, 13 which exten cross-wise of the battery and are located beneath'the respective heating walls 11, 11. These pillar WallS,.-tt'`,.

gether with other walls, hereinafter d0,` port.

scribed, collectively form the main-sup for the entire structureof the oven'battery andare themselves supported upon a flat mat or platform 19 which constitutes the sub-foundation on which the entire battery rests.

The coal to becoked is charged into the' several colcing chambers or ovens through Acharging holes 14. located in the to 15 of the oven battery and positioned irectly above the ovens or chambers 12, as shown in Figs. 2, 3 and 4. These charging holes 14 are equipped with the usual removable covers, which are removed during char ing of the individual ovens or coking cham ers and are placed in posltion to close the tops of such coking chambers during the entire.'

coking or distilling operation. The ases of distillation ass from the to 's o the several coking c iambers 12 throng gas outlets 16 and thence through ascension pipes (not shown) in to the usual gas collecting main which carries the distillation products to the by-product recovery apparatus.

Heat for coking the charges of coalv in the several ovens or chambers 12 is derived from the heating walls-11, which, asl above mentioned, extend cross-wise of the battery at the sides of the cokin chan bers. Referring now more particular y te igs. 3, 5 and 6, each he ting wall 11 is constituted of a urality o -diame or combustion flues, of which the rectahgular dues are designated by the reference character R, and the triangular dues by the reference character T. The triangular lues are of the type exemplified in my prior Patent No. 1,312,301, dated August 5, 1919 and in the prior patent ofJoseph Van Ackeren, No. 1,312,372, dated August 5, 1919. Whether rectangular or' triangular, the flame dues of each heating wall are operatively disposed into a single rou that is to say, all of the flame flues o eac heating wall operate concurrently as u -iiow or ooi ncaa-tao after more telly expiained. When the arne vihres on me side ora a coking chamber are burning, is to say, operating for upinw, the iiame nes on the opposite side of "he seme aching chamber are operating for down-fiorito permit exhaust of the waste gases Consecnently heating is maintained continnonsiy i om end to end ori-one side Vof a charge oi" cokng coal in each coking chamberythe heating` being applied tol the full length ci one side ci each charge during an entire operating period and, then, after reyersai, beine; appiied 'to the full length of the opposite side oit the'eharge until the subsequent reversa?, is eected.

Ehe crosswise regenerators -18 ot the retort oven, or battery are located at a lower levei than the aforesaid heating wal-ls 11 and ticking chambers 12, and, in the present instance extend in paralielism between the pilier waas 13 and the heavy supporting weils, hereinafter described. Located in the middie iengthwise vertical frame of the coke oven battery is a vertical partition 19, as shown in `iggs. 2 and 4, which partition entends ail the way up from the mat of the battery to the bottom of the overlyingl racking chamber/and i'rorn one to the other oi the pillar walis 13 and the other waiis which are between the pillar weils.. The regeneratcrs which are respectively located on opposite sides of the battery extend inwardly to said partition 19 and are separated thereby, as clearly shown. in Figs. 2 to a. Thisarrangem'ent permits control from opposite .sides of 'the battery of the 'flow' from the regenerators, thereby assisting the novel hie arrangement, in promotinfr nnitormity of distribution.

nach regenerator 18 is a chamber containing open brick work, commonly called checker work and indicated at 20, with distributing,sole5 channels 21, underneath such checker work, the channels forming the soles of such chambers and opening up into the work. As shown in Figs. 2 and a each regeneretor of .the pair of transverse @generators 18 is preferably provided with a yerticai 'baiiie 31 extending only part way up to the 'top of the regenerator and positioned substantiaiiy midway between the inner and outer ends oftheregenerator. There is alsopreterably a pair of sole channels 21 foreach regenerator,

one soie channel leading to ythat region oiv theA reggenerator which is between the bafiie 31 and the partition19, andthe other sole channel ai the pair leading Aindependently to theoiiter region or" the regenerator which :fis located between the bae 31, and the outer side .wallet the battery. This Aconstruction prordes important improvement tor the reason that it enablesseparatc control ci the tiow through the interior region 'of each regenerator, with the-,result that the How of -regenerators H,

through the interior regions of the several regenerators may be equalized relatively to the flow through those portions of the re' generators which are located nearer to the Side walls of the batte-ry, thereby promoting uniformity of distribution ot' the iow.l

Inthe presentembodiment oi' the invention, a heavy vertical gas-tight supporting'i'A wall 22 extends directly beneath the coking chamber' in parallelism between each two pillar walls 18, and such supporting walls 22 provide two generators G and H located respectively on the opposite sides of such walls 22 and between. adjacent pillar walls 13. The several walls 22 also have the function with the pillar walls 13 ot' supporting the weight ot the battery superstructure. This supporting wall construction provides two series -ot crosswise extendiner parallel gas-tight load carrying walls tlocated below the coking chambers and intermediate heating walls, the supporting walls ot' one series 13 being directly beneath the heating Walls, andthe support ing walls of the other series being direct-ly beneath the cohing,r chambers. The walls 22 whichare beneath the coking chambers are constructed and function not as mere partitions, commonly employed, but as true load-carrying gas-tight walls, permitting relatively ditierent-pressures to be maintained in the checker work chambers on the opposite sides of said walls or the, flow of different media in the checker work chambers separated by the walls Without leakages from one checkerwork chamber into another and without danger of mxinfY in the checkerwork chambers gases which must be kept separate iu this region of the battery. i v

The regenerators (i and H are heated in alternation by the -hot combustion products that drawl oit from the iiane or combustiony fines hereinbefore mentioned a'ndv then impart Such heat to the media that they feed into these ame lues; in the present instance, lthe 'flow through the regenerators G and H between each twoadjace nt pillar walls is maintained concurrently in opposite directions, for example, vwhen the How is vpassing up through a regenerator G downow is bein maintained concurrently through the ot. er re 'enerator H. The pairs thatv are respectively located on opposite sides of the pillar walls 13 are provlded .with aseries of ducts Q3, the ducts of each pair of regenerators leading respectively to {ia-me iiues 17 ot the same heatin wall, whereas the ducts 23 of the next ad}acent pair of regenerators lead y respectively to the flame ues of the next adjacent heating wall, as clearly shownin; Fig. 3. With this construction, each flame iue 17 communicates by ducts 23 with adjacent separate regenerators' H, G, and the flow through the regenerators H, G' which are respectively located on the opposite sides of a pillar wall 18, is maintained concurrently in the same direction, that is to Say) both said regeneration-s are either` operating for in-low or for out-flow.

In the present embodiment of the invention, the entire series of flame flues 17 of each heating Wall 11 is either burning or operating for down-flow4 to convey the waste products to the regenera-tors beneath and consequently the regenerators align on opposite sides of the central longitudinal partition 19 operate concurrently for flow in the same direction and in the same manlvated. as in-iiow. regenerators become out# 0f ilowregneratorsand the out-How operating regenerators become in-flow operating regenerators; the up-burning series of Hues' switches function ,with the downdlow -se'- 'ries of ues of the next adjacent heating walland the sup ly of gas'is turned off from 'the' previous y' 11p-burning ilues and turned on ,into the mains of the previously down-burning lues.

.anathema 17 of each hearing m11 has lat its top a port or opening 24 for draft and the .passage of.' combustion products or .waste gas from the -flame within the Hue. These ports 24j open 'upvk into horizontal or bus `h1e'si25af formed in the heating walls and connecting all of lthe vertical iiues which communicate. 'with such horizontal lilies 25 by ,means of the ports 24. According to the invention there are in each heating Wall a lurality', in the present instance two, of suc horizontal ues 25 positioned end to end withrespect to each other and respectively located on the opposite sides of the central dividing line L, By reason of the fact that' there is a plurality of vsuch horizontal fines-25, these ilues are not re-vquired to b e o'f so great capacity as that necessary in; present ractice, and consequently the cross-sectional area of each. horizontal lue maybe reduced proportionately with the length' of such flue, withthe result that the thickness and strength of the heating Walls are substantially increased in the region of the horizontal flues. Moreover because of the fact that each horizontal Hue 25 communicates with a substanl i flow throng tially reduced numberof vertical dues, in

the present instance half of the fines of thel heating wall, uniformity of distribution of* the flow in the vertical flues and the communicating' regenerators is greatly pro;-

. moted.

As shown in Figs. 5 and 6, each such horizontal flue 25 tapers ytoward its outer end in such manner that thesmallest cross` sectional area of each flue is located at -its end adjacent to the outer side wall of the battery.4 The tapering portion of the channel serves'to distribute the low equally through the several vertical ues 17 that are f located toward the'outer side of the battery and with which flue's such horizontal Huecommunicates. As shown, the two horizontal fines-25 of each heating wall are each communicably connected with the come spending horizontal ues of an adjacent heating wall by duct means comprising a pair ofpassageways or out-flow channels 26 4and 27. The channels 26 preferably open up into the mediate portions -of theirre4- s' ectivel"connected horizontal fines 25",' as

s own in Figs. 5 'and 6, whereas the channels 27 are located at and open up into the extreme inner ends ofV their respective conl nected horizontal tlues. With this con-5j;

struction each pair of horizontal` lues of' eachl heating Wall is communicably connected with the pairy of horizontal tlues'of the next adjacentheating wall, by mediate channels or ducts and interior channels orf.`

ducts corresponding-toea'ch pair oieon#Y nected liues, .the mediate -channels 26freceijcingthe How from and directing the Honnef- 1 the flues 17 that are located.towardf'k the outer side wal-ls of the batte and thein-k terior channels 27 receivingt e flow from 'and directing How into lues 17 that 'are Ilocated'inl the remotely interior regionsoff; the battery. Preferably that portion cti" Aeach horizontal flue 25 which` extends lief tween the pair of channels 26 and 27 is'jnot lia tapered but has substantial-ly trallel wallsi,

in order to Kermit equal distribution of thel both vchannels 26 and 27. In` f aslnuch as each horizonal Hue 25; is cofvl nected by a plurality of 'channels'or du s-v With the corresponding fiue of the -nerd; ad;

jacent heating wall, the individual channel-smi' may be made of reduced size, vwith corrida spondin strengthening` and thickening v (.vlf

-the wal structure in the :region of'fsuch channels. With* the aboyeconstrnctn tle entire How from the Vheatingvtall, within the ues of which combustion is being maintained; passes downwardly through alli/cf` the flues of the next adjacent heating wal and .e'i ch reversa-l operation is .accompan'ediv` by a reversal inl direction in flow throughj all ofthe lues of each heating Walle".

'The draft through the portsl 24 `'may regulated by means*` ofdthe usual mgyigmg;

' communication to each llame or reached'by access lines 29 which extendk from the top of the horizontal iiues in each heating wall to the ltop l5 of the battery, there being an access flue aliording l combustion ilue in each heating wall.-

Extending cross-wise of the battery in each pillar wall 13 and located beneath the heating wall 1l thereabove, is a pair of gas Supply channels 'and 32, These channels 30 and 32 are for the ,purpose of supplying coke oven as to the several llame lues on each side o the central line L, and to accomplish this end, the channel 29 communicates with the-individual liues 17 on one side of` said line L by means of ducts 33 that'lead from such channel 29 individually into the bottoms or" individual lines and the channel 32, which su I plies the several lines which are located on t e opposite sides ot' the beforementioned dividing line L, communicates therewith by means of similarly connecting ducts.. Within the several ducts are disposed the usual nozzles 34. The supply of coke oven gas to the respective channels 3G and 32 is derived from coke oven gas mains of the usual type and respectively located on the'opposite sides of the battery and extending longitudinally therealong. Suitable means is provided for admitting or cutting od the supply of gas with respect to each pair of channels 30 and 32, it being; understood that the gas supply iseither concurrently-maintained in or concurrently shut oil from both channels ci each air.

For operating the battery alternatively with the use of a special generator gas, such as producer gas as the fuel, the several regenerators H may be optionally connected with a producer gas main by mec anism such as is disclosed in my before-mentioned application, Serial No. 376,126, so that the producer gas may be directed into such of the regenerators H as are operating for in-ow and conveyed through these regenerators into burning llame lues 17.

The operation of the retort oven or batter when using a special generator gas, suc as ordinary producer gas, is as follows:

The supply of coke oven gas to the coke oven gas main and to all of the channels 30 and 32 is cut oil". A supply of producer .gas is permitted to BowJ into the alternate regenerators H, such as are operating for in-ow and passing through said regenerators is precated before being delivered into the burning llame lues. During the in-ow of the producer ges through such alternate regeneratore H, Waste gas from the down-burning ues is owing out into the intermediate regenerators G as well as through the re encraters` that are intermediate such a ternate regenerators. In the alternate fregencraters G iii-.flow of air is maintained and passing upwardly through such regenerators finally enters the burning flame dues to support the combustion of the producer gas that 1s delivered thereto by the alternate regenerators H. 0n reversal of the dow the in flow operating regenerators become out-flow regenerators and concurrently the out-dow operating regencrators become iniiow regenerators.

In operating the battery with coke oven gas in the ordinary manner, the supply of producer gas to alternate regenerators H is shutoli and air isy emitted to flow into such regenerators in' 'p ace oi' the producer gas.

VDuring colte oven gas operation a supply of lThe reversing mechanism is operated at each reversal to place ail of the in-ovv operating regenerators in communication with tihe outer air and concurrently, all. o the outiiow'operating regenerators in communication with the exhaust.

A further inode o` operation is with coke oven gas ase fuel, combined with e. supply of neutral gaseous diluent to the` 11p-burning flues. -ln so operating the battery,`the su ply of producer gas is turned oit' and't e supply ofcoke oven gas is turned-on, nstead, however, of permitting air to flow into alternate regenerators of the series H that serve for producer gas during the latter operation, waste gas is rmitted to dow into said regenerators and ne delivered thereby to the ugo-burnin ,ilues. rllhe admission into each of the upurning dues of a supply of neutral gaseous' diluent, such as waste gas, is effective to lengthen greetl the flames Within such lines and to prevent t e localisation of the hottest flame temperature in the extreme lower portions of the ducs.

rlhe. invention as hereinabove set forth 1s embo'd1ed 1n a particular form of construction but may be variously embodied within the scope of the claims hereinafter made,

I claim:

1. In a coking retort oven, in combination:

'an adjacent heating wall by duct means located at the inner portion of the horizontal liuc and also by duct means located between the ends of such horizontal iiue, each horiontal ue being tapered only from its mediate duct means toward its'outer end; and cross-wise regenerators parallel l with the coking chambers and the heatin Walls, auch regenerators being communicab y connected in pairs with the combustion lues of a single heating wall, 'and each regenerator having a bae between its opposite ends and separate sole channel means Aindividually communicably connected with those portions of the regenerator that are located on the opposite sides of said baffle; substantially as spec a plurality Aof coking chambers; heating Walls contiguous to such coking chambers and respectively constituted of vertical combustion lines; a plurality of horizontal iiues Vin each heating wall and respectively connecting a plurality of combustign flues o f, their respective heating walls; each horizontal fiue being also commumcably connected with the corresponding horizontal lue of an adjacent heating wall by duct means y located at the inner portion of the horiontal Hue and also by duct means located between the ends of such horizontal flue; and cross -wise regenerators parallel with the coking chambers and the heating walls, such regen- 1erators'- being communicably connected in -bustion fines; two horizontal. flues in each heating wall and respectively connecting a plurality of combustion flues of their respective`heating walls; each horizontal iiue being communicably connected with the corresponding horizontal flue of an adjacentr lheating wall by duct means located at the inner portion of the horizontal flue and also by duct means located between the ends of such horizontal flue; and cross-wise re enenators parallel with the coking cham ers and the heating walls, such regenerators being communicably connected in pairs with the combustion flues ot a single heating wall, and each rcgenerator having a balile between its opposite ends and separate sole channel means individually communicably connected with thosel portions of the regenerator that are located on the opposite sides of sai'd baiile; substantially as specified.

4.-. In acoking retort oven, in combination: a' lunality 'of @cking chambersg heating wa ls conti ous to such coking chambers and respectlvely constituted of vertical combustion tlues; a plurality of horiontal iues 1n each heating wall and'respectively connecting a plurality of combustion lues ofified. i

2. In a coking retort oven, in combination 1,ea4,1ao

located at the inner portion of the horizontal flue and also' by duct means located between the ends of such horizontal flue; and cross- `wise regenerators pxarallel with the coking chambers and the eating walls; and each regenerator having a, baiiie between its opposite ends land separate solehannel means' individually communicably connected with .l

those portions of the regenerator that are located on the opposite sides of saidbaiile;l

substantially as specified. I

5. In a coking retort oven, in combination a plurality of coking chambers; heating walls contiguous to such coking chambers and respectlvely constituted of vertical combustion flues; a. plurality of horizont-al iues S' in. each heating wall and respectively connectin-g a. plurality of combustion fines of their respective heating walls; each horizontal iiue being also communicably connected with the correspondin horizontal iiue of an adjacent heating wall y duct'means-located at the inner portion of the horizontal fluel and also by duct means located between the ends yof such/horizontal flue, each horizontal flue being taperedonly from its mediate duct means toward its Outer end; and re nerators communicably connected wit said- ,lues; substantially-,as specified.

6. In a coking retort oven, 'in combination: a plurality of cokingchambers; heating walls contiguous to such coking chambers and respectively constituted of vertical combustion vfines; a plurality of horizontal fines in each heating wall and respectively connecting"*plurality of combustion iiues of their respective heating walls; each horizontal fine being also communicably connected with the corresponding horizontal flue `ot' an adjacent heating wallnby duct means located at the inner portion of the horizontal line-and alsoby duet means located between the ends of such horizontal flue; and regenerators communicably connected with said tlues; substantially as specified.

7. In a coking retort oven, in combination: a plurality o-vcoking chambers; heating walls contiguousl to such coking'chambers'and respectively constituted of vertical combustion fines; and cross-wise regenerators parallel with the coking chambers and the heating walls, such regenerators being communicably connected in pairs with the combustion ilues ofa single heating wall,- and each regenerator having a balile between its opposite ends and separate 'sole channel means individually communicably connected with those portions ofthe regeneratorthat are located on the opposite-sides of said baie; substantially as specified.

8. In a coking retort oven, in combina- 17.99

11ny i bers and res respectively constituted ot combustion fines;

and regenerators parallel with the communieating chambers and the heating walls-each i'egenerator having a batile between its opposite ends and separate sole channel means individually eommunicably connecting in parallel those portions of the regenerator that are located on the opposite sides of said baille; substantially as specified.

10. In a coking retort oven. in combination: a plurality of coking chambers; heat ing Walls contiguous to such coking chamtively constituted of vertical combustion lues in each heating wall; and separate interior and mediate duet means communicably connecting each horizontal flue with the corresponding horizontal ue of anadjacent heating wall; substantially as specified.

11'. In combination .with a coking chamber, flued heating walls respectively constituting the. opposite side Walls of said coking chamber.` the fines of pairs of the heating walls being communicably connected with each other by separate interior and mediate duct means extending over the top' of the coking chamber; reversible means for main-4 taining combustion in alternation in said heating.,r walls, the exhaust gases produced by ues; a plurality of horizontalthc combustion in one heating Wall being drawn ofi' by the other, and reversible regenerators respectively communicating .with said heating walls; substantiallyv as specilied.

12. In a coking retort oven, in combina` tion: a plurality ot' coking chambers; heat ing walls contiguous to such coking chamhers and respectively constituted of vertical combustion flues; horizontal flow duct. means in each heating Wall; and separate interior and mediate duct means communlcably connecting each horizontal flow duct means with the corresponding horizontal tlow duct means of an adjacent heating Wall; substan' tiallv as specified.

13. In a cokinzgr retort oven, in combination: a plurality of coking chambers; heating walls contiguous to such coking-chamhers and respectively constituted of vertical combustion llues horizontal flow duct means in each heating wall; separate interior and mediate duct means eommunicably connecting each horizontal .flow duct means with the corresponding horizontal flow duct'means of an ad]acent heating wall; and regenerators serving saidheating Walls; substantially as specified.

14. In a coking retort oven, in combination': a plurality of coking chambers; heating walls contiguous to such coking chambers and respectively constituted of vertical' combustion tlues; horizontal flow duct means in cach heating wall.; separate interior and mediate duct means commnnicahlwr connecting each horizontal flow duct with the corresponding.r horizontal flow dnct'means of an adjacent heatingfwall; and cross-regenerators respectivel)1 serving said heating Walls and reversible Ain pairs longitudinally of the battery.

In testimony whereof I hereunto set my hand this 26th day of July. 1921.

JOSEPH BECKER. 

